The velocity field in the near wake of a small-scale, flexible, flat circular parachute canopy was measured by the particle image velocimetry method. The experiments were performed in a water tunnel with the Reynolds number ranging from 3.0-6.0 x10(4). Both a fully inflated canopy and the inflation phase were investigated. The fully inflated canopy experienced a cyclic 'breathing' motion with a normalized frequency of 0.56 +/- 0.03, which corresponded to the shedding of vortex rings from the canopy. The boundary layer formed on the canopy surface begins to separate near the apex region when the diameter is approximately 68% of the fully inflated diameter.
Aerodynamics of Parachute Opening
2002
131 pages
Report
No indication
English
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